package com.wanakiko.impldetails.noconstructor;

import lombok.Data;
import sun.misc.Unsafe;

import java.lang.reflect.Field;

@Data
public class SkipConstructor {
    /* 此处的属性无论是否添加final修饰均无影响 */
    private final Integer property1st;
    private final String property2nd;

    /* 静态代码将会执行 */
    static {
        System.out.println("Static code will execute...");
    }

    /* 非静态代码将不会执行 */
    {
        System.out.println("Non-static code will not execute...");
    }

    /* 构造器方法将不会执行(不执行初始化) */
    public SkipConstructor(Integer property1st, String property2nd) {
        this.property1st = property1st;
        this.property2nd = property2nd;
        System.out.println("The constructor method will not execute...");
    }
}

class DemoSkipCtor {
    public static void main(String[] args) throws NoSuchFieldException, IllegalAccessException, InstantiationException {
        /* 操作JVM指针跳过类的构造方法的执行，Unsafe非安全类在后续的JDK版本中可能将被剔除 */
        Field theUnsafe = Unsafe.class.getDeclaredField("theUnsafe");
        theUnsafe.setAccessible(true);
        Unsafe unsafe = (Unsafe) theUnsafe.get(null);
        SkipConstructor skipCtor = (SkipConstructor) unsafe.allocateInstance(SkipConstructor.class);
        System.out.println(skipCtor);
    }
}
